Lockout light High

Ideal Lockout light Fault Code

Also written as LOCKOUTLIGHT — same fault.

The Ideal Lockout light fault code means: your boiler has failed to start up or stay burning, so it has purposefully turned itself off for safety and will not heat your home or water until fixed.. It appears on 2 Ideal models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: The boiler does not light at the end of its ignition period. The controls will go to lockout almost immediately and the lockout light on the control panel will light.
Typical repair cost £150-350 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Ideal models that show the Lockout light fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Ideal Lockout light fault code information on this page is sourced and cross-checked against the official Ideal service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026